Software team always try to produce a product with zero defects. Defect prediction leads to high quality product and quality assurance. Software defects prediction aims to reduce software testing efforts by guiding the testers through the defect classification of software systems. If the defective product released to customer, at customer side defect became fault. Existence of defect reduces the software reliability. Predicting the defects need more practices and knowledge. So, defect prediction is very important in the field of software quality and software reliability.